一次梅雨锋暴雨过程的模拟诊断分析  

Simulation and Diagnostic Analysis of a Meiyu Front Rainstorm

作　　者：贺哲[1] 沈桐立[2] 

机构地区：[1]南京气象学院气象灾害和环境变化重点实验室 [2]南京气象学院大气科学系

出　　处：《南京气象学院学报》2004年第4期487-494,共8页Journal of Nanjing Institute of Meteorology

基　　金：国家自然科学基金资助项目(40075023);国家重点基础研究发展规划项目(G1998040910)

摘　　要：利用中尺度数值模式MM5对1998年7月28—29日发生于长江中下游的梅雨锋暴雨过程进行了模拟和诊断分析。结果表明,低层温湿扰动对于强对流的发展及暴雨的出现具有重要作用。低空急流核和切变线配合的存在有利于大暴雨的产生。湿位涡场结构在暴雨增幅期与暴雨增幅前期和暴雨减弱期有明显不同。The Meiyu front rainstorm occurred in the period from 28th to 29th July,1998 in the Yangtze River's middle and lower reaches is dynamically diagnosed and numerically simulated using the MM5,and results indicate that the temperature and moisture disturbance in the lower level plays an important role in the development of convection and the generation of the rainstorm.The joint occurrence of low-level jet and wind shear is beneficial to the out-growth of the strong rainstorm.The structure of moist potential vorticity field in the rainstorm period differs greatly from those before and after the period.

关 键 词：梅雨锋 温湿扰动 湿位涡 

分 类 号：P458.121[天文地球—大气科学及气象学]